Process of making and waterproofing paper tubes.



G. F. LINDSAY & 1'. MALONEY. PROCESS OF MAKING AND WATERPROOFING PAPERTUBES.

APPLICATION FILED MAY 28, 191 4.

1,130,304, Patented Mar. 2, 191 5.

NVEIVTORS A ram/5r areas an FTQ CHARLES E. LINDSAY, OF FAIRFIELD, ANDFRANK H. MAIiONEY, OF BRIDGEPORT CONNECTICUT, ASSIGNORS T0 UNIONMETALLIC CARTRIDGE COMPANY, OF BRIDGE- PORT, CONNECTICUT, A CORPORATIONOF CONNECTICUT.

menace.

Specification of Letters Iatent.

Patented Mar. 2, 1915.

Application filed May 28. 1914. Serial No. 841,530.

To all whom it may concern:

Be it known that we, (1) CHARLES F. LINDSAY, a subject of the King ofGreat Britain, and (2) FRANK H. MALONEY, a citizen of the 'UnitedStates, residing at (1) Fairfield and (2) Bridgeport, county ofFairfield, State of Connecticut, have invented an Improvement inProcesses of Making and Waterproofing Paper Tubes, of which thefollowing is a specification.

In the accompanying drawing forming a part of this specification, thefigure is a perspective showing a tube partly wound and therefrom, thepaper intended for such purposes is usually made uncalendered or nearlyso, and in order to produce tubes which will hold to their dimensionsunder variable climatic (trade) conditions, it is necessary towaterproof the same. This is usually done by impregnating the tubes witha water resisting compound, such as paraffin wax, or a like substance.The objection to this method of waterproofing is that, in order toeffect a satisfactory waterproofing, it is necessary to impregnate the,tubes with a large percentage of their weight of waterproofingmaterial. This, among other disadvantages, renders the tubes more orless translucent which, on account of the varying absorptiveness of thetubes, tends to cause an uneven appearance, especially when the tubesare colored, and gives to the tubes a mottled or blotchy character. Toprevent this and to insure the production of a fin-' ished article, thesurface of which will present an even color, and at the same time, givea superior waterproof quality to the tubes, we treat, by impregnating orcoating the tubes, either at the time of pasting or thereafter, with awater emulsion of a polymerizable vegetable oil partially saponifiedwith ammonia,'or with a water emulsion of a polymerizable vegetable oilmixed with wax, the oil being partially saponified with ammonia. Suchemulsion can be mixed with starch or other paste, or may be applied tothe pasted tubes by spraying or other means.

We recognize that tubes have been coated previously by spraying andother convenient means, and do not claim, any way, such operation aspart of our improvement.

The method preferably used is to first paste the tubes in the usualmanner on a machine suitably designed for the purpose, and then treatthe wet tubes with an emulsion made of; 2 parts each of Japan wax andChinese wood oil, (tung oil), 1 part of ammonium hydrate solution,with'specific gravity of 0.9, 40 parts of water. The tubes are thendried by heating, which also drives oif the ammonia from the tubes andgelatinizes the polymerizable oil contained therein. The tubes may thenbe sized and polished readily without the use of other lubricant, andmay, or may not, thereafter be treated in the usual waterproofing bathof parafin. It should be understood that the term sizing as herein usedrefers to thepassage of the tubes through dies, or by other meansbringing the tubes to exact size. If preferred, the drying of the tubesmay be carried out at ordinary temperatures, andthe evaporation of theammonia and the gelatinization of the oil performed by the heatgenerated in the sizing dies, or by other convenient means.

Tubes waterproofed as above described will be equal to or superior inwaterproof qualities to tubes thoroughly impregnated with parafiin waxand frequently containing.

thirty per cent. or more of waterproofing material, while tubeswaterproofed by our process contain only a small percentage,approximately two per cent. of their weight of gelatinized oil.

Having thus described our invention, we

tubes which consists in treating, by impregnation or coating, the papertubes with Chinese wood oil partially saponified by ammonia andemulsified in water, and thereafter heating the tubes in order toevaporate the ammonia and gelatinize the oil.

3. The process of waterproofing paper tubes which consists in treatingthe pasted but unsizecl paper tubes with a partially am monia saponifiedwater emulsion of Japan wax and Chinese wood oil, drying the same, andthereafter passing the tubes through suitableheated dies, whereby thetubes are sized, polished and waterproofed in one operation.

nieoeoa 4. The process of waterproofing paper tubes which consists intreating the tubes with a partially ammonia saponified water emulsion ofChinese wood oil and wax and thereafter heating the tubes whereby theammonia is driven ofi and the oil gelatinizeol therein.

In testimony whereof we afiix our signatures in presence of twowitnesses.

- onnnnns r. LINDSAY; FRANK H. MALUNJEY.

Witnesses LENA M. Jonnson, MARY S. 'BURRoneHs,

